Syringe&#39;s plunger locking/unlocking device



FIG. 1 is a front perspective view of a syringe's plunger locking/unlocking device showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a right side elevation view thereof. The left side is being a mirror image thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a bottom elevation view thereof; and,

FIG. 7 is a right side elevation view in conjunction with a syringe. The broken lines shown in this view is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a syringe's plunger locking/unlocking device, as shown and described. 